Door.



A. T. PRESCOTT.

DOOR.

- APPLICATION FILED APR. 10, I9l6- 1,274,443, Patented Aug. (3, 1918.

. 4 SHEETS:SHEET l- A. T. PRESCOTT.

DOOR.

APPLICATION FILED APR. I0, HIIB.

Patented Aug. 6, 1918.

4 SHEETS-SHEET 2.

A; T. PRESCOTT.

DOOR.

APPLICATION FILED APR. 10, 91s.

1,274,44k3. I Patented (s, 1918.

4$HE [ET 3.

A. T. PRESCOTT.

APPLICATION mw APR. I0. 19:6.

Flu ucul'oz 5%*/% 44% UNITED STATES PATENT OFFICE.

ARTHUR T. PRESCOTT, OF EAST ORANGE, JERSEY, ASSIGNOR T0 GEORGE H. FROTHINGHAM COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

DOOR.

Application filed April 10, 1916.

a citizen of the United States of America and a resident of East Orange, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Doors, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof. 1

My invention relates to doors and has special reference to large, heavy doors, such as are employed in factories, warehouses,

pier sheds and the like. It furthermore, specially pertains to doors having two or more sections, hereinafter referred to as multi-section doors, which are opened by first elevating one of the lower sections upon the section above'and finally swinging the overlapping sections into a horizontal or an inclined. position above the door opening.

In doors of this character, difficulty has been encountered hitherto because the hoisting mechanism usually exerts forces in vertical planes and some means is consequently required mam the sections to swing inwardly,in other words, to make the door break in. If, as has frequently been attempted, means are employed for positively "effecting the breaking in of the door, an-

other difiiculty develops, viz., that of tightly A closing .the door against the casing which is specially troublesome with large doors when closing in opposition to strong wind pressure. It will be readily understood that the difficulties are so related to each other that any means which serves to overcome one, tends to increase the other.

It has been my aim to provide simple and durable means for eliminating both of the above-named difliculties at the same time. In other words, to provide a suitable mechanism capable of being attached to a multisection door and adapted to assist the breaking in of the door in opening and to posi tively hold the door tightly in its closed position when the door is shut.

My invention is by no means restricted to any particular door structure and its application to doors of various types will be readily understood by those skilled in this art Flore specifically, one object of my invention is to provide an improved and efi'ec tive mechanism dependent upon the normal Specification of Letters Patent.

Patented Aug. 6, 1918.

Serial No. 90,045.

movement of one of the door sections in opening for causing the top of the door to swing inwardly so as to avoid undue strains upon the hoisting mechanism and so as to facilitate the opening of large, heavy doors.

Another object is to provide means for holding the top of the door firmly closed against the casing and to facilitate its closingunder adverse conditions.

Another object is to provide a single mechanism that shall be adapted to not only swing the top of the door inwardly when the door is being opened, but also to positively swing the top of the door closed when it is being shut.

Another object is to provide a simple and reliable mechanism for positively holding the (1001' closed when once it is shut and dependent upon the upward movement of one of the lower door sections upon the section above, not only for its release, but also for practically freeing the door entirely from its influence so as to remove the possibility of retarding the opening of the door particularly when it first starts to swing inwardly at the top.

Other objects of my invention-will be set .forth hereinafter, and in order that my inment of my invention.

A vertical section of the same door at right angles to Fig. 1, is shown in Fig.2.

Fig. 3 is a view corresponding to Fig. 2, but drawn to. a larger scale and showing the door with the bottom section folded upon the upper section.

Fig. 4 is a front elevation showing one of the open and close mechanisms in front elevation, drawn to the same scale as Fig. 3.

Fig. 5 corresponds to Fig. 3, but shows the door in a slightly advance position, that is, with the upper end swung inwardly from the casement-to a slight extent.

Figs. 6 and 7 are sectional plan views, taken respectively on the lines 6-6 and 7-7 of Fig. 3. i

Fig. 8 is a sectional elevation showing a detail of one of the latches which form parts of the mechanism of the previous figures.

This view is taken on .theline 8- 8 of Fig. 6.,

parts are designated by the A modification of my invention is shown in Fig. 9, which corresponds to Fig. 3, Fig. .10 being a sectional plan view taken on the line 1010 of Fig. 9 and corresponding to Fig. 7.

Still another modification of my invention is shown in' Fig. 11 whicln also corresponds -to Fig. 3.

Fig. 12 is a sectional plan view on the line 1212 of Fig. 11, and Fig. 13 is a plan view showing the. samemechanism more completely.

Fig. 14 closely corresponds to Fig. 2 and shows the mechanism of Figs. 9- and 10 as applied to a door of a different type. This .is for the purpose of indicating the Scope of my invention.

special reference may first be hadto Figs. 1 to 8 inclusive, although corresponding same reference characters in all of the figures. The door opening is defined by side posts and a lintel 31. The door comprises an upper section 32 suspended from above the-door opening by links 33, and a lowe'r door section 34 to which hoisting chains or other flexible cords 35 are connected. The upper section is provided with guideways 36 in V which the lower'section runs, the upward movement of the lower section on theupper f section being limited in the usual manner by pins 37 located near the lower corners of the lower section and extending beyond the gui'deways 36. Rollers 38 are mounted onthe. pins and cooperate inany suitable manner with the door posts 30 which may be provided with guideways. Y

In opening the door the lower section slides upon the upper section until the two are overlapped; then the two sections together swing away from the lintel of the door at the top until they occupy a sub- 4 stantially horizontal or an inclined plane.

My invention is applicable to doors which operate in substantially the manner justoutlined irrespective of the means of support and the details of the structure.

The hoisting chains 35 cooperate with the sheaves 39 which are secured to a head shaft 40 and form parts of a suitable hoisting mechanism designated 41. Counterweights 42 are suspended from the opposite ends of the hoisting chains, the operation of. the

door being controlled by a hand chain 43.

, .The hoisting mechanism as well as the details of the mounting of the door in them selves, form no part ofmy invention and are Well known. In fact, my invention is particularly .concerned with what may be termed a break and close mechanism g which is designated 44 and'will now be described.

Two mechanismswill usually be employed as shown in Fig. l but the number is immaterial and will depend upon the'size of the door. It is only necessary to describe one'in detail as they are, identical and attention is particularly directed to Figs. 3

to 8.. Secured above the door opening is a hereinafter, has an important function inconnection with the closing of the door.

The mechanism 44 in addition to the stationary bracket 45 and its attachments, comprises a bracket 52 attached to the upper door section 32 near its upper end,

a bell crank -lever,53 and a latch 54 pivotally I mounted on a common shaft or pin 55 of the bracket 52. As clearly shown in Fig. 6, the latch 54 has a central recess 59 forming a pair of spaced hubs 60 between which a single hub 61' of thebell crank lever 53 is disposed, the bracket 52 being bifurcated to provide a,pair of spaced bearings '62 in which the pin or shaft 55 is supported. j

The mechanism furthermore, comprises an actuating member 56 which is attached to the lower door section .34'near its upper end and is provided with a pivotal arm or finger 57 which acts like a rigid lateral projection when the member is-moving upwardly and the door is. opening, and is pushed aside as hereinafter explained, in op.- position to a'spring 58 when the door is closing and the lever ismoving downwardly. V

One arm 63 of the bell crank lever 53 is substantiallyperpendicular to the plane ofv l the. door when the door is closed, as shown in Fig. 3, and theother arm is substantially upright but curves or extends inwardly at its upper end and terminates in a T-sh-aped extremity '64. As clearly indicated inFig. 7,

the arms of the extremity 64 are adapted to engage the guideways 46, the arrangement 65, tends to-force the door intoits closed osition where it is held by the engagement of parts being such that when the door is .nearly closed, the bell crank lever 53 swings of the latch 54 with the hooked projection 47 of the bracket 45. The latch 54 is held in a'set position. by a spring 66, its engaging end '67 being beveled at 68 so that it is cammed past-thelhook projection of the bracket in awvell. known manner. i

The opposite arm of the latch 54- from the e of the bell crank-lever 53.

The bracket 52 is provided with an arm i 69 which extendsoutwardly and upwardly from one of the hubs 62 and has. an enlargement 70 at its outer end in which a pawl 71 is mounted to slide transversely. As shown in Fig. 8, this pawl is provided with-an enlarge'ment 72 at one end having a beveled surface 73 which is engaged by the end of the bar 49 as the door swings to its closed position. When the door is closed the bar 49, as clearly indicated in Fig. 3, rests upon the top of the enlargement 72 of the latch 71, being raised to this position in opposition; to the spring-51 by the final closing move ment .of the door. J f

Before describing the other embodiments of my invent-ion, I will discuss the operation of the door .and mechanism already 'described.

Assuming that the door is closed, as shown -in Figs. land 2, to open the door the hand.

chain43, is operated in a well known mannerto cause the lower section 34 to slide upwardly in the guideways 36 ofv the upper section. The Inember'56 now approaches the remainder of the mechanism 44, the parts occupying positions substantially as shown -in Figs. 3 and 4.

A continued upward movement of the section 34 with the member 56, brings the arm or finger 57 into engagement' with the outerarm'of the latch 54, which is thus swung about the pin 55 as a" pivot in opposition-to the spring 66, until it engages the arm 63 of the bell crank lever 53. Still-further upward movement ofthe door sections actuates thebell crank lever 53 which reacts upon the bracket 45 and as'it swings, it forces the top of the door sections away from the lintel in an openingdirection as shown in Fig. 5.

.This action is a positive action and effectually breaks in the doorso that a. further upward pull transmitted to the door sections" through the hoisting chains 35,

readily causes the door to 'swing into its open position in which the sections are only slightly inclined to" the horizontal (see broken lines in Fig. 2). As clearly indicated in'Figf 5, the guideways 46 are limited in length so that the T-shaped head of the lever 53 is disengaged -therefrom after the lever has performed its-function of breaking in the door and the door is free to open. The bracket 52, together with its arm 69, is

- atiiXed to the, upper section of the door, as

already cxplained,'and consequently, as the door opens, the enlargement moves out from under the bar 49. which is then drawn by the spring 51 against the stop 50. v I

The last movement of'the bottom section 34 upon the upper section 32 swings the bell crank lever 53 in opposition to the spring 65 sulliciently to permit the arm 57 of the member 56 to pass. As soon as this arm or finger passes, the bell crank lever would be free to swing back to its initial position except that it is held substantially in the position shown in Fig. 5 by the'latch 71 which has been cammcd back by.the upward movement of the latch 54 and now holds both the latch 54 and the lever 53 in an inclined position with the springs 65 and 66 under tension.

From this point the door swings open in the usual manner and the mechanism pcrforms no function until the door approaches the position shown in Fig. 5 in closing.

In closing the door thehand chain-is actuated in the reverse direction and the'door sections swing downwardly coming into the position of Fig. 5 except that the bar 49 is now in position to actuate the latch 71 by engaging the beveled surface 7;- This will be apparent by an inspection of Figs. 5 and 6.

\Vhen the T-shaped end ofythe lever 53 has engaged the guideways 46 and the bell crank lever has been released from the pawl 71, the bell crank lever swings about the pointof contact between the T-shaped end and the guideways by reason offthe action of the. spring 65 as already explained, with theresult that the 'doors are forceably swung lower section 34 has advanced downwardly so as to release the latch 5% which is then in against the door casing and into the posi- -t1on shown in Fig. In the meantime, the

readiness to engage theho'ok projection 47 of the bracket 45, thereby securely holding the door against the casing. As soon as the lower section descends to the position shown in Fig. 2,.the door is completely closed.

Thus, it is evident that the same mechanism constitutes'a means which is dependent upon the upward movement of the lower door section for breaking in the door at the top and, furthermore, performs the very useful and desirable function of forceably swinging the door into its closed position against the casing. more comprises a means for locking the door in its closed is reached. 1

Thetwo difficulties whichhave been hereinbefore explained, although they impose The mechanism.furtherposition as soon as this position many opposed conditions and forces, are

both eliminated by a relatively simple and compact mechanism which is entirely automatic in its operation.

The mechanism may be modified if it is not desired to forceably closethe doors, as

for example, where the door is protected and is not subject to high wind. pressure,

tending to open it, or where thedoors are I hook projection 47 as before, but has no structure the stationary bracket 45 has the guideways, so that its body constitutes merely a wearing plate against which the end of the hellerank lever 53 bears. The bracket 52* supports the bell crank lever 53 and the latch 54 as before, but has no arm its cooperating parts are n0t-'used.- Y

latch 54: and actuated the bell crank lever 53, so as to -break in the door, the'arm or finger 57 pushes the bell cranklever out of the way and moves past its arm 63-permitting the bell crank lever to be swung back to its initial position as the door is closed,

without performing any function. In this case, the mechanism as already pointed out, does not assist in closing the door,-but as soon as thedoor swings into its closed position the latch 54 engages the hook projection 47 and holds the door closed as in the previously described mechanism.

Referring now to Figs. 11, 12 and 13, in

which still another modification of the mechanism 44 is disclosed,'the bracket 45 -is provided with a boss 74: at its upper end which is recessed to provide a pocket 75 to receive the upper end of the bell crank lever 53 The end of the bell crank lever 53 cooperates with the hollow boss 7 4 in a similar manner to that in which the T-shaped end 64: ofthe lever 53 cooperates with the guideways 16, except that the parts only come into cooperation when the door is almost closed. This cooperation is however,

sufiic'ient in many cases to give the door the required impetus to cause it'to move forceably against the door casing'so as to permit the latch-54 to engage the hook projection 47 of the bracket. This modification difiers in another particular, from that of Figs. 1 to 8 inclusive in the construction of the actuating member 56 which insteadof having a laterally extending armor finger 57, has a pivoted section76 joined to the body of the arm by a hinge pin 77 and pressed against a stop 78 by a spring 7 9; Furthermore, the outer end of the member 76 is notched as indicated at. 80 to form a ledge -81 against which the latch 54 rests from the time the door has been broken inuntil thedoor is closed against the casing. Then as the lower section 34: descends the overhanging finger 82 of the member 76 is cammed by the surface83 of the bell crank lever and pushes the member 76 away so that the downward movement of the door is not interfered with.

As clearly shownin Fig. 14 l,.the 1nechanism of Figs. 9 and 10 is applicable to a door which. is.suspended and operates in a difienent manner, the structure here shown comprising horizontal supporting rails or guidelower section 34 cooperateswith guideways hangers ways 84; which are continuquslyengaged by rollers-85 supported on brackets86 near the corners of the upper door section 32. The

36 and is provided with actuating arms 56 anism 44 is similarly arranged and pers forms the same functions as already described in connection with the Figs. 9 and 10.

It may obviously be replaced by the mechavnism -.of Figsrl to 8 orv that of Figs. 11 to .1 correspondingto the arms 56. The mech- 13, none'o-fthe mechanisms being limited in its field of usefulness to a door'having any special suspension means or structural details. r

The operation of the door of Fig. 14: is

similarin general, to that of the previous figures, the section 34 being elevated to oversubstantially 1 horizontal position above the doorway. J

' It is evident that-the structures illustrated may be modified in various'particulars, and the mechanisms applied to doors of various types within the'spirit and scope of my invention, and I intend that only'such limi-- tations be imposed as are indicated in appended claims. a

WhatI claim is: 1.'The combination with a door casing comprising side posts and a lintel defining thedoor opening, of a door comprisingan upper section, links, suspending the sect on. from above the door-opening, stationary guide ways on the doorposts, a lower door section adapted to cooperate with the upper;

" section and provided with means tocooperate with the guide ways on the door posts, a

stationary guide above the door-opening, a

'bell crank lever pivotally mounted on the acting upon the bell crank lever tending to swing the top of the door closed.

2. The combination with a door casing comprising side posts and a lintel defining the door-opening, of a door comprising an upper section,- links suspending the section from above the door opening, stationary guide ways on the door posts, a lower door section adapted to cooperate withthe upper sectionand provided at its-lower corners with means to cooperate with the guide ways on thedoor posts, a stationary guide above the door-opening, a bell crank lever pivotally mounted on the upper section and' adapted toengage the stationary guide above the door-opening when the door approaches its closed position, and a spring attached to the bell crank lever. and tending to throw the top of the door inward against the casing when the bell crank lever engages the stationary guide above the door opening.

3. The'combination with a door casing comprising side posts and a lintel defining the door-opening of a'door comprising an upper section, links suspending the section from above the door-opening, stationary guide Ways on the door posts, a lower door section adapted to cooperate with the upper section and provided with means to cooperate with the guide ways on the door posts, a stationary guide above the door-opening, a bell crank lever pivotally mounted on the upper section and adapted to'engage the stationary guide above the -door-opening when the door approaches its closed position, and means acting upon the bell crank lever tending to swing the top of the door closed, and means dependent upon the opening of the lower door section fpr actuating the bell crank lever to break in the door at the top in opening.

4. The combination with a door casing comprising side posts and a lintel defining the door-opening, of a door comprising an upper section, links suspending the section from above the door-opening, stationary guide ways on the door posts, a lower door section adapted to cooperate with the upper section and provided at its lower corners with means to cooperate with the guide ways on the door posts, a stationary guide above the dooropening, a bell crank lever pivotally mount, ed on the upper section and adapted to engage the stationary guide above the dooropening when the door approaches its closed position, and a spring attached to the bell crank lever and tending to throw the top of the door inward against the casing when the bell crank lever engages the stationary guide above the door opening and means dependent upon the lower door section for actuating the bell crank lever in opposition to the spring for breaking in the door at the top.

5. The combination with a door casing comprising side posts and a lintel defining the-door-opening, of a door comprising an upper, section, links suspending the section from above the door-opening, stationary guide ways on the'door posts, a lower door section adapted to cooperate with the upper section and provided at its lower corners with means to cooperate with the guide ways on'the door posts, a stationary guide above the door-opening, a bell crank lever pivotally mounted on the upper section and adapted to engage the stationary guide above the dooropening when the door approaches its closed position, and a spring attached to the bell crank lever, and tending to throw the top of the door inward against the casing when the bell "crank lever engages the stationary guide above the door opening, and an arm attached to the lower door section for actuating the bell crank lever to break in the door at the top when the lower door section overlaps the upper section in opening.

6. The combination with a door casing comprising side posts and a lintel defining the door-opening, of a door comprising an upper section having guideways near its edges, a lower section adapted to slide upon the upper section and cooperate with said guideways, links suspending the upper section from above the door-opening, stationary guideways on the door posts, rollers at the lower corners of the lower section cooperating with' the stationary guideways on the door posts, a stationary guide bracket secured above the door opening and having a hooked projection, a bell crank lever pivotally mounted on the upper edge of the upper door section and having one arm adapted to cooperate with the guide bracket, a latch coaxially pivoted with said bell crank lever and adapted to engage said hooked projection for holding the door against the easing at the'top, a spring acting upon the bell crank lever, to force the door closed at the top when-the bell crank arm engages the guide bracket, an and attached to the lower door section and adapted to release the latch and actuate the bell crank lever in opposition to thespring to break in the door at the top and release the bell crank lever from the guide bracket, a latch supported by the upper-door section for holding the bell crank lever in position to cooperate with the guide bracket in closing, and a releasing lever pivotally mounted above the. door-opening tor tripping the holding latch when the bell crank lever engages the bracket in closing.

7. The combination with a door casing comprising side posts and lintel defining the door-opening, of a door comprising an upper section, a lower section adapted to slide upon the upper' section, means for suspending the door to permit it to swing out of a vertical position above the door opening, a stationary guide bracket secured above the door-opening and having a hooked projection, a bell crank lever pivotally mounted on the upper door section and having one arm adapted to cooperate with the gulde bracket, a latch co-axially pivoted with said bell crank lever and adapted to engage the said hooked projection for holdmg the door closed at the top when the bell crank arm engages the guide bracket, an arm "attached to the lower door. section and ing, and a releasing lever pivotally mount- .-ed above the door-opening for t'rip ing the of a vertical position above the door-opening, a stationary guide bracket securedholding latch when the bell crank lever eng gages the bracket in closing. 7

8. The combination with a door casing comprising 'side posts and a lintel definlng the door-opening, of a door comprising an upper section, a lower section adapted to slide upon the upper'section, means for suspending the door to permit it to swing'out above the ,door-openingand'having a hooked projection, a bell crank lever pivotally mounted on the upper section and having one arm adapted to cooperate with the guide bracket, a latch adapted to engage said hooked projection for holding the door against the casing at the top, resilient means acting upon the bell crank lever to force the door closed at the top when the bell crank arm engages the guide bracket, an arm: at-' tached to the lower door section andf-adapted to release the latch andaotuate the bell crank lever in opposition to the resilient.

' means to break in the doorat the topand release the bell crank lever from the guide bracket, a latch supported by the upper door section for holding the bell crank-lever in position to cooperate with theguide'bracket in closing, and a releasing lever pivotally mounted above thedoor-opening for tripping the holding latch when the bell crank lever engages the bracket in; closing;

9. The combination with a door'casing comprising side posts and a lintel defining the dooropening, of-a door comprising an upper section, a lower section adapted'to slide upon the' upper section, means forsuspending the door to permit it to s wing out of a vertical position above the door-opening, a stationary'guide bracket secured above the door-opening and havinga hooked pro jection,a bell crank lever pivotally mounted on the upper door section and having one arm adapted to cooperate with the guide bracket, a latch adapted t6 engage said hooked projection for holding the door against the casing at the top, resilient means acting upon the bell crank lever ,and cansing it to force the door closed at-the top I when the bell crank arm engages the guide 10. The combination with a door casing comprising side posts and a lintel defining the door-opening, of a door comprising an upper section having guidcways near its edges, a lower section adapted to slide upon the upper section and, cooperate with said guideways, links suspending the upper sechooked ravees operating with the stationary ,guideways on thedoor posts, a stationary guide bracket secured above the door-opening and'having hooked projection, a bell crank lever piv-' otally mounted on the upper edge of theupper door section and having one arm adapted to cooperate with the guide bracket,

crank lever and adapted to engage said hooked projection for holding the door against the casing at the top, a spring act-' ing upon the bell cranklever toforce the door closed at the top when the bell crank arm engages the guide bracket, a lever at .tached to the lower door section and adapted to release the latch and actuate the bell crank lever in opposition to the spring to *brealrin the door at the top and release the -b'ell crank lever from the guide bracket.

' The combination with a .door casing" comprising side posts and alintel defining the "door-opening, of a doorcomprising an upper section, a lower section-adapted to slide upon the upper section, means for sus-.

pending the door to permit it to swing out of a vertical position above the door-opening, a stationaryguide bracket secured abovethe door-opening ,and having a hooked projec tion, abell crank lever pivotally mounted on the upper door section and having one arm adapted to cooperate with the guide bracket, a latch co-axially pivoted with said crank leverand adapted to engage; said hooked projection for holding, the door 7 against the casing at the-top, a spring act ing upon the'bell crank lever and causing it to forcethe door closed at the top'when the bell crank arm engages the guide bracket,

an arm attachedto the lower door section and adapted to release the latch and actuate, the bell crank lever in oppositipn to the spring to break in the door at the top an'd release the bell crank lever from the guide bracket. i

- The ombination of a door casingcomprising s1 e posts, and a lintel-defining the door-opening, of a door comprising an upper section, .a lower section adapted to slide upon the upper section, means for suspend ing the door to permit it to swing out, of a vertical position .above the door-opening;

a stationary guide bracket secured. above the dom-opening'and having a hooked projection, a .bell crank lever pivotally'mounted on the-upper door section and having one arm adapted to cooperate with the guide bracket, a latch adapted to engage said rojection for holding the door against t e casing at the top, resilient means acting, upon the bell crank lever to force the door closed at the top when the bell crank arm engages the guidebracket, an

'75 .7 a latch co-axially pivoted with said "bell f garages adapted to release the latch and actuate the means to break in the door at the top and release the bell crank lever from the guide bracket. I

13. An attachment for multi-section doors comprising, for the upper door section, a

bell crank breakingdn lever, a spring tend ing to hold said lever in a retracted position and a latch for-holding the lever in its 'actuated position, for the lower door section,

an actuating lever having a spring-pressed finger adapted to coiiperate with one arm of the bell crank lever, and a stationary guide bracket adapted to cooperate with the other arm of the bell crank lever.

14. An attachment for multi-section doors comprising for the upper door section, a bell crank breaking-in lever, a spring tending to hold said lever in a retracted position and a latch for holding the lever in its actuated position, and for the lower door section, an actuating lever adapted to cooperate Withone arm of the bell crank lever.

15. An attachment for multi-section doors comprising for the upper door section, a bell crank reaking-in lever, a spring tending to hold said lever in a retracted position and a latch for holding the lever in its actuated position, for the lower door section, an actuating lever havin' the bell crank lever, and a stationary guide bracket adapted to cooperate. with the other arm of thel'bell crank lever, and a release comprising side posts and-a lintel defining a'door opening, of a door section, means for suspending said section arranged to cause it a spring-pressed. finger adapted to 006p a 0 With one arm of -to swing out of a vertical position above the door opening in openlng and to permit it to swing back into a vertical position in closing, and an elongated pivotal member engageable with a rigid member, the pivot and rigid member being mounted on the door section and the casing, one on one and the other on the other, so that the member may be canted transversely to the door by relative movement of said rigid member'or pivot, or of the pivoted member pivotally with relation to either, and arranged to force the top of the door section against the lintel in closing.

17. The combination with a door casing comprising side posts and a lintel defining a door opening, of an upper door section, a lower door section, guide connections between the door sections to provide for the lower door section being raised up beside the upper section, means for suspending said sections arranged to cause them to swing outo't' a vertical position above the door opening in opening and to permit them to swing back into a vertical; position in closing, and an elongated pivotal'member engageable with a rigid member, the pivot\and the ri id member being mounted on the door section and the casing,rone on one and the other on the other, so that the member may be canted transversely to the door by relative movement of said rigid member, or pivot, or of the pivoted member pivotally with relation to either, and an ranged to force the top of the door section against the lintel in closing, the pivoted member being controlled by themotion of the lower door section relative to'the upper section.

In Witness whereof, I have hereunto set, 

